title: Improved in vitro bioassay of follitropin.
abstract: The FSH-dependent aromatase activity of Sertoli cell enriched cultures of testicular cells from immature rats was utilized as a sensitive and specific in vitro bioassay for FSH activity. The conversion of 19-hydroxyandrostenedione to estradiol was used as the end point of the assay. By the introduction of a phosphodiesterase inhibitor into the culture medium, the sensitivity was improved 5-10 times, so that 0.05 mIU of FSH showed a response significantly different from the blank. Other pituitary or placental hormones, such as hLH, hTSH and hCG exhibited less than 0.8% cross-reactivity, whereas hGH, hPRL, ACTH1-24, LH-RH, and prostaglandin E2 alpha did not show any cross-reaction at the doses tested.
mesh_terms: D000818:Animals; D001681:Biological Assay / Q000379:methods*; D004958:Estradiol / Q000032:analysis; D005640:Follicle Stimulating Hormone / Q000032:analysis*; D066298:In Vitro Techniques; D008297:Male; D011863:Radioimmunoassay; D051381:Rats; D011919:Rats, Inbred Strains; D012708:Sertoli Cells / Q000032:analysis
chemical_list: D004958:Estradiol; D005640:Follicle Stimulating Hormone